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| author | Alan Modra <amodra@gmail.com> | 2018-04-09 09:22:53 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2018-04-09 17:05:09 +0930 |
| commit | 2d7ad24e8726ba4c45c9e67be08223a146a837ce (patch) | |
| tree | 8a2b8f6e54f874207d4ee8c66f9180448d4f35ca /ld/emulparams | |
| parent | 49c09209d06885dc8350042ce77e442bfbb5bf27 (diff) | |
| download | gdb-2d7ad24e8726ba4c45c9e67be08223a146a837ce.zip gdb-2d7ad24e8726ba4c45c9e67be08223a146a837ce.tar.gz gdb-2d7ad24e8726ba4c45c9e67be08223a146a837ce.tar.bz2 | |
Support PLT16 relocs against local symbols
Necessary if gcc is to use PLT16 relocs to implement -mlongcall, and
there isn't a good technical reason why local symbols should be
excluded from PLT16 support. Non-ifunc local symbol PLT entries go in
a separate section to other PLT entries. In a fixed position
executable they won't need to be relocated, and in a PIE or shared
library I chose to not implement lazy relocation.
bfd/
* elf64-ppc.c (LOCAL_PLT_ENTRY_SIZE): Define.
(struct ppc_stub_hash_entry): Add symtype field.
(PLT_KEEP): Define.
(struct ppc_link_hash_table): Add pltlocal and relpltlocal.
(create_linkage_sections): Create pltlocal and relpltlocal.
(ppc64_elf_check_relocs): Allow PLT relocs on local symbols.
Set PLT_KEEP.
(ppc64_elf_adjust_dynamic_symbol): Keep PLT entries for inline calls.
(allocate_dynrelocs): Allocate pltlocal and relpltlocal.
(ppc64_elf_size_dynamic_sections): Size pltlocal and relpltlocal.
Keep PLT entries for inline calls against locals.
(ppc_build_one_stub): Use pltlocal as appropriate.
(ppc_size_one_stub): Likewise.
(ppc64_elf_size_stubs): Set symtype.
(build_global_entry_stubs_and_plt): Init pltlocal and write
relpltlocal for globals.
(write_plt_relocs_for_local_syms): Likewise for local syms.
(ppc64_elf_relocate_section): Support PLT for local syms.
* elf32-ppc.c (PLT_KEEP): Define.
(struct ppc_elf_link_hash_table): Add pltlocal and relpltlocal.
(ppc_elf_create_glink): Create pltlocal and relpltlocal.
(ppc_elf_check_relocs): Allow PLT relocs on local symbols.
Set PLT_KEEP. Adjust update_local_sym_info call.
(ppc_elf_adjust_dynamic_symbol): Keep PLT entries for inline calls.
(allocate_dynrelocs): Allocate pltlocal and relpltlocal.
(ppc_elf_size_dynamic_sections): Size pltlocal and relpltlocal.
(ppc_elf_relocate_section): Support PLT16 relocs for local syms.
(write_global_sym_plt): Init pltlocal and write relpltlocal.
(ppc_finish_symbols): Likewise for locals.
ld/
* emulparams/elf32ppc.sh (OTHER_RELRO_SECTIONS_2): Add .branch_lt.
(OTHER_GOT_RELOC_SECTIONS): Add .rela.branch_lt.
* testsuite/ld-powerpc/elfv2so.d: Update for symbol/stub reordering.
* testsuite/ld-powerpc/relbrlt.d: Likewise.
* testsuite/ld-powerpc/relbrlt.s: Likewise.
* testsuite/ld-powerpc/tlsso.r: Likewise.
* testsuite/ld-powerpc/tlstocso.r: Likewise.
gold/
* powerpc.cc (Target_powerpc::lplt_): New variable.
(Target_powerpc::lplt_section): Associated accessor.
(Target_powerpc::plt_off): Handle local non-ifunc symbols.
(Target_powerpc::make_lplt_section): New function.
(Target_powerpc::make_local_plt_entry): New function.
(Powerpc_relobj::do_relocate_sections): Write out lplt.
(Output_data_plt_powerpc::first_plt_entry_offset): Zero for lplt.
(Output_data_plt_powerpc::add_local_entry): New function.
(Output_data_plt_powerpc::do_write): Ignore lplt.
(Target_powerpc::make_iplt_section): Make lplt first.
(Target_powerpc::make_brlt_section): Make .branch_lt relro.
(Target_powerpc::Scan::local): Handle PLT16 relocs.
Diffstat (limited to 'ld/emulparams')
| -rw-r--r-- | ld/emulparams/elf32ppc.sh | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/ld/emulparams/elf32ppc.sh b/ld/emulparams/elf32ppc.sh index c3da115..477279c 100644 --- a/ld/emulparams/elf32ppc.sh +++ b/ld/emulparams/elf32ppc.sh @@ -15,6 +15,10 @@ GOTPLT=".plt ${RELOCATING-0} : SPECIAL { *(.plt) }" PLT=".plt ${RELOCATING-0} : SPECIAL { *(.plt) } .iplt ${RELOCATING-0} : { *(.iplt) }" OTHER_TEXT_SECTIONS="*(.glink)" +OTHER_GOT_RELOC_SECTIONS=" + .rela.branch_lt ${RELOCATING-0} : { *(.rela.branch_lt) }" +OTHER_RELRO_SECTIONS_2=" + .branch_lt ${RELOCATING-0} :${RELOCATING+ ALIGN(4)} { *(.branch_lt) }" EXTRA_EM_FILE=ppc32elf if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then # crt1.o defines data_start and __data_start. Keep them first. |